Tidy: missing </aaa> before <bbb>
Cause:
A closing tag </aaa> is missing before the opening of another tag <bbb>. This is probably due to a implicit close of the <aaa> tag due to the opening of the <bbb> tag.
Example:
There are 2 types of tags in the body of a HTML file, inline and block tags.
In the following sample, the <font> tag is an inline tag defined as containing only inline tags. But the <p> tag is a block tag. So,
- a <p> tag can not be contained in a <font> tag.
- when seeing a <p> tag the font tag is implicitely closed.
 | <font size=2><p>abc</p></font> |
 | <p><font size="2">abc</font></p> |
 | <p style="font-size: 80%">abc</p> |
 | <div style="font-size=80%"><p>abc</p></div> |
A <font> tag should be contained in a <p> tag and not the opposite. Also, a better way to define the graphical look of a HTML page is to use Cascaded Style Sheet and use HTML only for the content.
Solution:
Move inline tags into block elements.
References: